VOOZH about

URL: https://oeis.org/A218210

⇱ A218210 - OEIS

login
A218210
Number of primes up to 10^n that are of the form (k-2)^2 + (k-1)^2 + k^2.
4
2, 3, 6, 10, 22, 53, 139, 369, 1050, 2984, 8618, 24390
OFFSET
1,1
COMMENTS
There are two primes < 10: 2 and 5.
FORMULA
a(n) = sum(A218209(k), k=1..n)
MATHEMATICA
n = -1; cnt = 0; Do[While[n++; p = 3*n^2 + 2; p < 10^e, If[PrimeQ[p], cnt++]]; n--; cnt, {e, 10}] (* T. D. Noe, Oct 23 2012 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Martin Renner, Oct 23 2012
STATUS
approved